I prepared the bass bar, sizing it according to a well-known law from mechanical engineering science that allows for constant bending stress along its entire length.
The goal is to uniformly stress the chain and, therefore, the top to which it is glued, allowing the entire surface to bear the load. This way, I don’t suffocate the top at the center between the f-holes where the load is locally applied, but rather allow the upper and lower bouts to be elastically involved in the acoustic breathing.
Then I closed the through hole of a small knot on the cherry back with a willow pin.
